4 Answers

• for those who are trying to use this, please note that now you can access the token directly from the Ti.Facebook API. Once logged in just use Titanium.Facebook.accessToken.

  Example:

  function updateLoginStatus() {
      if(Titanium.Facebook.loggedIn){
          Ti.API.info("Token:"+Titanium.Facebook.accessToken)
      }
  }
  

• Ok people if someone is interested, here's the solution I've choosen:
  I used the Titanium.Facebook api to connect with Facebook and get a session (thanks a lot to Altaf Sayani who indicate me how to build a valid session proxy).
  Here is the post about it.

  Then I exchanged the session with an oauth access token
  (see the FB developer page)

  And now I can make the open graph requests!

  Code strong people

• @Brice,

  How are you managing the difference between the session expiration from the Titanium.Facebook and the Open Graph one?

  Thanks

• After logging in using the current Ti.Facebook functions to get the session_key, I then use this to exchange it for an access_token to use with the Graph API

  var app_id = 'YOUR_FACEBOOK_APP_ID';
  var app_secret = 'YOUR_FACEBOOK_APP_SECRET';
  
  function exchangeFacebookSessionKeyForAccessToken(){
  
      // Exchanges the current session_key via OAuth for an access_token
  
      var xhr = Titanium.Network.createHTTPClient();
      xhr.timeout = 1000000;
      xhr.onerror = function(e){
          Ti.API.info('IN ERROR ' + e.error);
      };
      xhr.onload = function(){    
  
          var reply = eval('('+this.responseText+')');
          Ti.API.info('Access Token : '+reply[0].access_token);
  
      };
      var endPoint = 'https://graph.facebook.com/oauth/exchange_sessions';
      xhr.open('POST',endPoint);
      xhr.send({
          client_id:app_id,
          client_secret:app_secret,
          sessions:Ti.Facebook.session.session_key
      });
  
  }